一个语法问题，is to teach people......

One of most effective measures to minimize the dagers of driving

is to teach people to obey all the rules of the road

这里在“is to teach people to....”is 后面为什么要加那个to呢？

请高手解答下，谢谢。

一个语法问题，is to teach people...... volleyball is very interesting to watch的语法问题？ the only thing that you should do is to try your best.语法有问题么? Water is to fish what air is to man!中what air is to man是什么语法功能？ Access to knowledge and learn how to behave, is the eternal theme of education这句话的语法有问题吗? 一个语法问题 问一个语法问题 一个语法问题~~~~重赏!!! 一个语法问题，求证 请教一个语法问题